Fish aquarium



FIG. 1 is a front perspective view of a fish aquarium showing my new design;

FIG. 2 is a front view of such aquarium;

FIG. 3 is a rear view of said aquarium;

FIG. 4 is a top plan view of said aquarium;

FIG. 5 is a bottom view of said aquarium; and,

FIG. 6 is a view showing the right side of said aquarium with the left side of the aquarium presenting a mirror image of the side shown in FIG. 6. 

The ornamental design for a fish aquarium, as shown and described. 